You can use the default-web.xml file to define features such as filters and security constraints that apply to all web applications.
The mime-mapping elements in default-web.xml are global and inherited by all web applications. You can override these mappings or define your own using mime-mapping elements in your web application's web.xml file. For more information about mime-mapping elements, see the Servlet specification.
You can use the Admin Console to edit the default-web.xml file. For details, click the Help button in the Admin Console. As an alternative, you can edit the file directly using the following steps.